Some anti-virus progs are better at picking up stuff than others. I kept having some weird problems and I d/l the AVG Free edition and it found some things nothing else did and I haven't had any problems since (knock wood). Hope this helps and good luck!
Thank you VERY much for that AVG link. My free antivirus software is expiring (becoming for-fee) and I needed another one. I had saved your data about AVG and it proved extremely timely. I've installed it and it's a better program than the one I had.
I should think it would be in the best interests of all companies that produce software to install or bundle such a product free, since the more PC's that have this up and running worldwide, the less damage virii can cause. Kind of like vaccinating a population against smallpox.
All you friends of Ayn, I do not normally make a plea for a product to be free, so please don't take the time to assault me for being a *whatever* on the subject. This is an aberrative stand rooted in a public "safety" issue, so to speak. A lot of people who have computers aren't techie enough to take care of this.